A VPN icon can show “connected” while a website still discovers an IP address you never intended to share. The culprit is often WebRTC, the browser technology behind video calls, voice chats, screen sharing and peer-to-peer data transfers.
For readers who want to understand the mechanism behind this exposure,what Is a WebRTC Leak explains how ICE candidates, STUN requests and direct peer-to-peer connections can reveal an address that differs from the IP assigned by a VPN or proxy.
As of July 2026, Chrome controls roughly 68% of the global browser market. Safari accounts for about 16%, Edge for 5% and Firefox for just over 3%. Together, these browsers represent more than 90% of worldwide usage, making WebRTC privacy relevant to almost everyone who connects through a VPN or proxy.
WebRTC itself is not a security bug. It is a technology designed to establish fast, direct connections between browsers. The privacy risk appears when WebRTC traffic follows a different network route from regular browser traffic.
What Exactly Does a WebRTC Leak Reveal?
To establish a connection, WebRTC uses Interactive Connectivity Establishment, commonly known as ICE. The browser gathers possible connection paths called ICE candidates. It may contact a STUN server to discover the public address assigned by a router or use a TURN server when traffic must pass through a relay.
Three candidate types matter most. A host candidate represents an address connected directly to the device. A srflx, or server-reflexive candidate, contains the public IP address detected by a STUN server. A relay candidate points to a TURN relay rather than directly to the user.
Modern browsers frequently replace private addresses such as 192.168.1.25 with temporary .local mDNS names. This protects some information about the local network, but it does not necessarily hide the public address discovered through STUN. Seeing a .local value therefore does not prove that the browser is completely protected.
How to Prevent WebRTC Leaks in Chrome
Chrome does not provide ordinary users with a simple “Disable WebRTC” switch. Turning the technology off entirely would break Google Meet, Discord, browser-based call centers and other communication services.
The most reliable approach is to use a properly configured full-tunnel VPN and then test the browser. A full-tunnel VPN routes both conventional browser requests and WebRTC connections through the virtual network adapter. Split tunneling is riskier because some UDP traffic may continue through the physical connection.
Chrome also supports several WebRTC IP-handling modes. The strictest policy, known as disable_non_proxied_udp, prevents WebRTC from opening direct UDP connections outside the configured proxy. This option has existed since Chrome 48, although activating it usually requires a trusted browser extension or an administrator-managed policy.
Installing a random “WebRTC blocker” is not always a good solution. These extensions may request access to privacy-related browser settings, so the developer, update history and permissions should be checked carefully.
How to Stop WebRTC Leaks in FirefoxThe Direct Firefox Method
Firefox offers the most straightforward manual control. Enter about:config in the address bar, accept the warning and search for:
media.peerconnection.enabled
Changing the value from true to false disables peer-to-peer WebRTC functionality. It is an effective option for people who never use browser-based video, audio or peer-to-peer applications.
The cost is compatibility. Video-conferencing platforms, browser calling services and certain file-sharing tools may stop working. If online calls are part of the daily workflow, it is usually better to leave WebRTC enabled and use a full-tunnel VPN.
Firefox users should repeat the leak test after major browser or VPN updates. A working configuration can change when network permissions, extensions or browser privacy settings are updated.
How to Prevent WebRTC Leaks in Microsoft Edge
Edge is built on Chromium, so its consumer-level WebRTC behavior is similar to Chrome. It has no prominent universal off switch. The practical options are a full-device VPN, a reputable WebRTC-control extension or an organization-level browser policy.
Microsoft provides administrators with a policy called WebRtcLocalhostIpHandling. Its stricter modes can restrict local IP exposure and disable non-proxied UDP connections. This makes managed Edge installations easier to secure consistently across dozens or hundreds of workplace devices.
For personal computers, the simplest approach is to route the entire connection through a reliable VPN and verify the result. Users should not assume that WebRTC automatically follows an HTTP or HTTPS proxy.
How to Reduce WebRTC Exposure in Safari
Safari supports WebRTC for video conferencing but does not offer the same clear IP-handling menu found in Brave. Blocking camera and microphone permissions is useful, yet it should not be confused with blocking all WebRTC connections. The technology can create data channels without accessing either the camera or microphone.
Network-level protection is therefore more dependable for Safari users. A full-tunnel VPN should support both IPv4 and IPv6 and include a kill switch. If the real internet service provider address still appears during a WebRTC test, split tunneling or an uncovered IPv6 route may be responsible.
People who do not need browser calling can also separate their activities. Safari can remain the general browser, while a more tightly configured browser is used for work involving proxies, multiple accounts or location-sensitive services.
How to Prevent WebRTC Leaks in Brave
Brave provides some of the clearest built-in controls among Chromium-based browsers. Open brave://settings/privacy, locate WebRTC IP Handling Policy and select the required protection level.
“Default Public Interface Only” limits the addresses available to WebRTC while preserving direct connections through the normal public route. “Disable Non-Proxied UDP” is stricter and is generally the safer choice when using a proxy.
The stricter setting prevents WebRTC from creating direct UDP connections that bypass the configured proxy. Calls may instead fall back to TCP or a TURN relay, which can increase latency. That trade-off is often acceptable when keeping the original IP address private is more important than achieving the lowest possible call delay.
Why Proxy Users Need Extra Protection
An HTTP proxy normally handles HTTP, HTTPS and WebSocket traffic. WebRTC, however, prefers low-latency UDP connections. If a proxy cannot carry UDP traffic, the browser may attempt to contact a STUN server directly.
This creates conflicting network signals. A browser profile may use a German proxy while WebRTC reports a Dutch residential IP. The proxy, time zone, browser language and WebRTC address then describe different users.
Tools such as Gologin manage WebRTC behavior at the individual browser-profile level alongside the assigned proxy. This is more practical than repeatedly changing global browser settings when every profile needs a separate network identity.
Always Test the Result
Run a WebRTC leak test before activating a VPN or proxy and record the original public IP address. Connect the privacy tool, reopen the browser and perform the test again.
If a public or srflx result still shows the original ISP address, the connection is leaking. If it displays the VPN or intended proxy address, the routing is working correctly. A .local host candidate generally means that mDNS is hiding the private LAN address, not that WebRTC has been disabled.
Repeat the test after changing browsers, networks, VPN servers, extensions or proxy settings. WebRTC protection is not a setting that can be configured once and forgotten. It is part of the browser’s network routing, and that routing can change.